Dialectal or informal term, possibly meaning inclined to cuffing or hitting, or resembling a cuff.
From 'cuff' plus the suffix '-y' (meaning having the quality of, or characterized by). Primarily historical or regional usage with unclear original sense.
The suffix '-y' is incredibly productive in English—you can add it to almost any noun to make an adjective ('cuff' becomes 'cuffy,' 'mud' becomes 'muddy'), which is why English speakers can understand new descriptive words they've never heard before.
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